Hi chinmay !
If u r getting this alarm on specified TRXs (One) u can swapp this TRX with another one (Same Type -TSGB,A,TRXA,D …etc) if the problem will be transferded to with this TRX u have to chenge the TRX!!
Otherwise u have check all cables and jumpers and the connectors every where.
Of course u can do the above after VSWR checking, if its good u can only swapp the TRXs.
Tell me please where exactly u r getting this alam?On whole sector, segment, BTS, or only on one TRX?!